Abstract

The rapid advancement of digital payment technologies has revolutionized the way financial transactions are conducted, yet it has simultaneously introduced new security challenges. This research presents a comprehensive framework to enhance the security of smart payment systems by emphasizing the critical role of software developers in safeguarding transaction integrity. The proposed model incorporates robust encryption techniques, secure API practices, multi-factor authentication (MFA), and real-time fraud detection mechanisms to mitigate threats such as data breaches, identity theft, and financial fraud. Furthermore, the study ensures alignment with global compliance standards including PCI DSS, GDPR, and PSD2, while encouraging the adoption of secure software development practices like DevSecOps. Through analysis of real-world implementations such as Apple Pay, EMV chip cards, and blockchain-based networks, the research highlights practical applications of the framework. The study concludes with strategic recommendations for integrating Zero Trust Architecture, biometric authentication, and cross-border security measures to future-proof payment infrastructures. This framework provides developers and financial institutions with a scalable, secure, and regulation-compliant blueprint for building resilient smart payment platforms.